Is there is any way to find which email i have used
If you’re using n8n Cloud, there’s no way to retrieve the email from the UI once you’re logged out.
Your options are to check your inboxes for n8n signup or billing emails, look in your browser’s saved passwords or autofill history, or see if you’re still logged in on another device and can view the account settings there.
If none of that works, you’ll need to contact n8n support and prove ownership of the workspace by providing details like the subdomain, approximate signup date, last login, or billing information if applicable. For security reasons, n8n does not offer any self-service way to look up the account email.